I've found that \mathbb{1} works when using mathpazo:
\documentclass{article}
\usepackage{mathpazo}
\begin{document}
$\mathbb{1}$
\end{document}

But \mathbb{0} doesn't work (doesn't display anything at all), and my searches haven't led me to any solutions so far. Is it possible to get a blackboard-bold 0? Or other numbers?


\mathbb{0}? You will need to tell us which packages you are using, and give a MWE. – Pureferret Feb 12 '12 at 14:31mathpazo. And no,\mathbb{0}doesn't work. – jtbandes Feb 12 '12 at 14:38